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//Variable declaration
d=970; //density(kg/m**3)
Na=6.02*10**26; //avagadro number
w=23; //atomic weight
m=9.1*10**-31; //mass(kg)
h=6.62*10**-34; //planck's constant
//Calculation
N=d*Na/w; //number of atoms/m**3
x=h**2/(8*m);
y=(3*N/%pi)**(2/3)
EF=x*y; //fermi energy(J)
//Result
printf('fermi energy is %0.3f eV \n ',(EF/(1.6*10**-19)))
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